Narrated `Abdullah bin `Umar: The Prophet ﷺ said: “Make Witr as your last prayer at night.”
عَنْ عَبْدِ اللَّهِ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ اجْعَلُوا آخِرَ صَلاَتِكُمْ بِاللَّيْلِ وِتْرًا
[Sahih Al-Bukhari, Book of Witr Prayer, Hadith: 998]
Chapter: Witr as the last Salat (at night).